The OTM file extension stores macro written for Microsoft Outlook email client application. All Outlook macros are kept in a single VbaProject.otm file that contains scripted programs created in the Visual Basic Editor. These functions are used for scanning email messages or collecting file attachments.
Project Files
Microsoft Office Outlook
Microsoft Corporation
Application/octet-stream
Outlook 2007 on Windows Vista/Windows 7
Drive:\Users\(user)\AppData\Roaming\Microsoft\Outlook\VbaProject.OTM
Outlook 2010 on Windows Vista/Windows 7
Drive:\Users\(user)\AppData\Roaming\Microsoft\Outlook\VbaProject.OTM
Drive:\Users\(user)\AppData\Roaming\Microsoft\Outlook\VbaProject.OTM
HKEY_CLASSES_ROOT\.otm
HKEY_CLASSES_ROOT\OTMFile
HKEY_CLASSES_ROOT\Outlook.File.otm.14
HKEY_CLASSES_ROOT\Outlook.File.otm.15
The OTM extension is created and opened using MS Outlook Email Client.